Henry Holtgeerts

The simple, no-frills block to easily embed PDF files on your WordPress site. 100% free, fully responsive and built for the Gutenberg Editor.
Quickly add PDFs from your media library, or paste a URL. This PDF Block is inspired by the Image Block for Gutenberg, and maintains tremendous ease of use.
Options: 
– Change PDF URL (from Media Library, or copy/paste one manually) 
– Show or Hide PDF toolbar 
– Control PDF alignment 
– Adjust PDF height
Compatibility: 
– Fully responsive 
– Works fine on Chrome, Firefox, Opera, Edge and IE11 
– Does not require Javascript for users to see PDFs
This PDF Block takes advantage of browser’s native support of PDFs, allowing users to view and interact with your PDFs without the need for any Javascript.

PDF Block

The simple, no-frills block to easily embed PDF files on your WordPress site.

eugenealegiojo

The plugin that will let admin user to add download links to any posts/pages in simplest way and hassle free. 
Allows all your site visitors to download any files from your website without any user restriction.
<h4>Features</h4>
<ul>
<li>Downloader button is available in your admin content editor for post, page or post type. Shortcode will be generated automatically.</li>
<li>Insert download links manually via shortcode [media-downloader] to any posts, pages or custom post types. Check for more parameters below (Embedding).</li>
<li>Allow users to directly download in all file formats for free.</li>
<li>No file size limit for downloads. 
For more information please check the <a href="http://phplugins.softanalyzer.com/simple-file-downloader/" rel="nofollow ugc">Simple File Downloader</a> documentation page</li>
</ul>
<h4>Embedding / generated Shortcodes</h4>
Create a new post/page and click the ‘Add Download’ button from the content editor, then generate the shortcode below:
<pre><code>[media-downloader media_id="9" texts="Download Now!"]
</code></pre>
Media id is automatically added from your media library.
Here are the all the available parameters when generating shortcode for file download:
texts
If you choose to leave the texts parameter empty, then it be defaulted to ‘Download File’.
image_url
You can also use image/button as your download link. If you supplied this parameter, then texts parameter will be replaced by this image.
<pre><code>[media-downloader media_id="9" image_url="http://domain.com/wp-content/themes/images/button.png"]
</code></pre>
class
You can add class to your download link either a texts or image button. This is useful if you want to apply your own style.
<pre><code>[media-downloader media_id="9" texts="Download PDF" class="download-pdf"]
</code></pre>
display_filesize
You also have an option to display the size of the file. Just set it to ‘yes’
<pre><code>[media-downloader media_id="9" texts="Download PDF" display_filesize="yes"]
</code></pre>

Simple File Downloader

Simplest way to add download links into your posts/pages.

PDF Block vs Simple File Downloader